an isotope is a triangle with 2 equal sides silly goose!
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Isotopes are different forms of an element that have the same number of protons but different numbers of neutrons in their nuclei, resulting in different atomic weights. This difference in atomic weight among isotopes is what distinguishes them from a regular element.
The element with its own isotope and the symbol D is deuterium. Deuterium is an isotope of hydrogen with a nucleus containing one proton and one neutron, making it twice the mass of regular hydrogen.
An atom with a different number of neutrons is called an isotope of the original element. Isotopes have the same number of protons (and thus the same element) but different numbers of neutrons.
The two main factors in determining the average atomic mass of an element are:the isotopic composition of the element (the fraction of each isotope)the atomic mass of each isotope
average atomic massof an element=(Atomic mass of first isotope X % of that isotope) + (Atomic mass of second isotope X % of the second isotope)
If an element has one and only one stable isotope, an example is Gold.